If you are referring to "unused RRSP contributions carried forward", here's how to go about applying those unused RRSP contributions to your current year return:

https://turbotax.community.intuit.ca/replies/3225121

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If your RRSP Contribution Limit is different in TurboTax than what CRA has on record, here's how to change that:

https://turbotax.community.intuit.ca/replies/2647688